Meander slot antenna structure and antenna module utilizing the same

Abstract

A meander slot antenna structure for transmitting a wireless signal is provided. The meander slot antenna structure includes a substrate, a ground element, a feed conductor and a couple conductor. The substrate includes a first surface and a second surface, wherein the first surface is opposite to the second surface. The ground element is disposed on the second surface, wherein a meander slot is formed in the ground element. The feed conductor is disposed on the first surface, wherein the feed conductor corresponds to the meander slot. The couple conductor is disposed on the first surface and coupled with the feed conductor, wherein a via passes through the substrate and electrically connects the couple conductor to the ground element.

What is claimed is: 
     
       1. A meander slot antenna structure for transmitting a wireless signal, comprising:
 a substrate, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface; 
 a ground element, disposed on the second surface, wherein a meander slot is formed in the ground element; 
 a feed conductor, disposed on the first surface, wherein the feed conductor corresponds to the meander slot; and 
 a couple conductor, disposed on the first surface and coupled with the feed conductor, wherein a via passes through the substrate and electrically connects the couple conductor to the ground element. 
 
     
     
       2. The meander slot antenna structure as claimed in  claim 1 , wherein the couple conductor is disposed longitudinally, the couple conductor comprises a connection end and a free end, and the via is connected to the connection end. 
     
     
       3. The meander slot antenna structure as claimed in  claim 2 , wherein the meander slot comprises a resonance path edge, the feed conductor overlaps with the resonance path edge at a feed point, and when the meander slot antenna structure transmits the wireless signal, a reverse current travels from the feed point, along the resonance path edge, passes through the via to the couple conductor, and travels along the couple conductor to the free end. 
     
     
       4. The meander slot antenna structure as claimed in  claim 3 , wherein the length of the path traveled of the reverse current is λ/4, and λ is a wavelength of the wireless signal. 
     
     
       5. The meander slot antenna structure as claimed in  claim 3 , wherein the resonance path edge comprises a U-shaped portion. 
     
     
       6. The meander slot antenna structure as claimed in  claim 5 , wherein a partition slot is formed in the ground element, the U-shaped portion forms a notch, and the partition slot is inserted into the notch. 
     
     
       7. The meander slot antenna structure as claimed in  claim 3 , wherein the couple conductor extends along a portion of the resonance path edge. 
     
     
       8. The meander slot antenna structure as claimed in  claim 3 , wherein the feed conductor comprises a coupling portion and a feed portion, the coupling portion is connected to an end of the feed portion, and the feed conductor is T-shaped. 
     
     
       9. The meander slot antenna structure as claimed in  claim 8 , wherein the coupling portion is disposed longitudinally and parallel to the couple conductor. 
     
     
       10. The meander slot antenna structure as claimed in  claim 9 , wherein the coupling portion is totally inside a projection area of the meander slot, and the feed portion overlaps with the resonance path edge at the feed point. 
     
     
       11. An antenna module for transmitting a wireless signal, comprising:
 a substrate, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface; 
 a ground element, disposed on the second surface, wherein a first meander slot and a second meander slot are formed in the ground element, and a central line is located between the first meander slot and the second meander slot; 
 a first feed conductor, disposed on the first surface, wherein the first feed conductor corresponds to the first meander slot; 
 a first couple conductor, disposed on the first surface and coupled with the first feed conductor, wherein a first via passes through the substrate and electrically connects the first couple conductor to the ground element; 
 a second feed conductor, disposed on the first surface, wherein the second feed conductor corresponds to the second meander slot; and 
 a second couple conductor, disposed on the first surface and coupled with the second feed conductor, wherein a second via passes through the substrate and electrically connects the second couple conductor to the ground element. 
 
     
     
       12. The antenna module as claimed in  claim 11 , wherein the first couple conductor and second couple conductor are disposed longitudinally, the first couple conductor comprises a first connection end and a first free end, and the first via is connected to the first connection end, the second couple conductor comprises a second connection end and a second free end, and the second via is connected to the second connection end. 
     
     
       13. The antenna module as claimed in  claim 12 , wherein the first meander slot comprises a first resonance path edge, the first feed conductor overlaps with the first resonance path edge at a first feed point, the second meander slot comprises a second resonance path edge, the second feed conductor overlaps with the second resonance path edge at a second feed point, when a first signal is fed to the first feed conductor, a first reverse current travels from the first feed point, along the first resonance path edge, passes through the first via to the first couple conductor, and travels along the first couple conductor to the first free end, and when a second signal is fed to the second feed conductor, a second reverse current travels from the second feed point, along the second resonance path edge, passes through the second via to the second couple conductor, and travels along the second couple conductor to the second free end. 
     
     
       14. The antenna module as claimed in  claim 13 , wherein the first meander slot has a first isolation portion formed on the first resonance path edge, the second meander slot has a second isolation portion formed on the second resonance path edge, the first isolation portion and the second isolation portion extend toward the central line, and a gap is formed between the first isolation portion and the second isolation portion. 
     
     
       15. The antenna module as claimed in  claim 14 , wherein the first isolation portion and the second isolation portion are longitudinal, and arranged on a same line. 
     
     
       16. The antenna module as claimed in  claim 14 , wherein the first isolation portion and the second isolation portion are L-shaped, and arranged symmetric to the central line. 
     
     
       17. The antenna module as claimed in  claim 14 , wherein the first feed conductor comprises a first coupling portion and a first feed portion, the first coupling portion is connected to an end of the first feed portion, the first feed conductor is T-shaped, the second feed conductor comprises a second coupling portion and a second feed portion, the second coupling portion is connected to an end of the second feed portion, the second feed conductor is T-shaped. 
     
     
       18. The antenna module as claimed in  claim 17 , wherein the first feed portion is parallel to the first isolation portion, and the second feed portion is parallel to the second isolation portion. 
     
     
       19. An antenna module for transmitting a wireless signal, comprising:
 a substrate, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface; 
 a ground element, disposed on the second surface, wherein a first meander slot and a second meander slot are formed in the ground element, a central line is located between the first meander slot and the second meander slot, the first meander slot has a first isolation portion, the second meander slot has a second isolation portion, the first isolation portion and the second isolation portion extend toward the central line, and a gap is formed between the first isolation portion and the second isolation portion; 
 a first feed conductor, disposed on the first surface, wherein the first feed conductor corresponds to the first meander slot; and 
 a second feed conductor, disposed on the first surface, wherein the second feed conductor corresponds to the second meander slot. 
 
     
     
       20. The antenna module as claimed in  claim 19 , wherein the first isolation portion and the second isolation portion are disposed longitudinal, and arranged on a same line. 
     
     
       21. The antenna module as claimed in  claim 19 , wherein the first isolation portion and the second isolation portion are L-shaped, and arranged symmetric to the central line. 
     
     
       22. The antenna module as claimed in  claim 19 , wherein lengths of the first isolation portion and the second isolation portion are shorter then λ/8, and λ is the wavelength of the wireless signal. 
     
     
       23. A meander slot antenna structure for transmitting a wireless signal, comprising:
 a substrate, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface; 
 a ground element, disposed on the second surface, wherein a meander slot is formed on the ground element and comprises a resonance path edge; 
 a feed conductor, disposed on the first surface, wherein the feed conductor corresponds to the meander slot, and the feed conductor overlaps with the resonance path edge at a feed point; and 
 a couple conductor, coupled with the feed conductor and comprising a free end, wherein, and when the meander slot antenna structure transmits the wireless signal, a reverse current travels from the feed point, along the resonance path edge to the couple conductor, and travels along the couple conductor to the free end.